There are many factors affecting the efficacy of herbicides, the most important of which are the following: 1. The relationship between temperature and humidity The herbicide is applied when the temperature is high and the humidity is high. The weeds are easily absorbed, the grass killing effect is remarkable, and the higher the humidity, the better. When the temperature reaches the limit, the sprayed liquid quickly It is evaporated, especially for those herbicides that are volatile and easy to decompose. The humidity is very high (dew water or rain soon in the morning), because there is a layer of water on the blades of grass to spray the liquid with the water drops. Rolling off also affects the efficacy. Generally mastered in the windless days, the morning dew is about 10 o'clock or the evening is the best. Biological pesticide China Pesticide Network http:// Concealed Shower Set,Shower Set,Dual Shower Head System,Rainfall Shower Combo kaiping aida sanitary ware technology co.,ltd , https://www.kpaidafaucets-jm.com
2, soil water content relationship soil moisture and high water content, favorable crops and weeds grow vigorously, when herbicides can enhance the absorption capacity of weeds, accelerate the transport in the body, so that herbicides play to kill weeds Effects; such as drought, less rain, slow growth of crops and weeds, and crops are weaker, so resistance is poor, and weeds will make stems and leaves form better cuticles and fruit micelles, stems and leaves It becomes dry and the liquid is difficult to be absorbed and transmitted by weeds. Therefore, applying herbicides in dry weather increases the amount of liquid and increases the amount of water sprayed.
3, the soil solution pH alkaline or excessive alkali will make the herbicide decomposition, directly affecting the efficacy of the herbicide.
4, the use period is generally applied before and after sowing and pre-emergence seedlings, can be applied herbicides, but different herbicides have the best period of application of the best, and before or after sowing (bud) before the application For the spraying of stems and leaves, it should be used in the post-emergence; if the requirements for post-emergence weeding are to master the weeds 2-3 leaf period, if the spray has been over-aged weeds, the effect is poor. Therefore, we must correctly master the appropriate application.
5, spraying quality when spraying, the liquid is not evenly mixed, so that the whole barrel of liquid medicine is inconsistent, there will be grass killing effect after spraying, and some will have no effect, there will be insufficient water spray or low dose or Too high, affecting both the killing effect and even the phytotoxicity.